Carbon brush.



R. P. HAUSEN.

CARBON BRUSH. APPLIOATIONVHLBD DBO. 1a,I 1913.

Patented July 21, 1914 WiTNESSES.

W @QM narran STATES PAEENT OFFICE. f

RAYMOND F. HAUSEN, OF PITTSBURGH, PENNSEVANIA, ASSIGNOR T0 :PITTSBURGH CARBON BRUSH COMPANY, A COPABTNERSHIP COMPOSER OF GEORGE Fi. STIMPLE AND RAYMOND Fi HAUSEN, OF PITTSBURGH, PENNSYLVANIA.

CARBON BRUSH.

Specification of Letters Patent.

Patented July 21, igt/t@ Application nea neeember 19, 1913. semi No. 807,618.

To all whom it may concern:

Be it known that I, RAYMOND F. HAUsnN, a citizen of the United States, and resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Carbon Brushes; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates tov carbon-brushes for dynamos, motors and other electrical machines, and more especially to the means for attaching` conductors to said brushes.

The object. of my invention is to provide for the securing of the conductor to the .carbon-brush in such a manner that the conductor is secured rigidly in position, so that it cannot work loose and virtually becomes an integral partof the brush itself. y

To these ends, my invention consists, generally stated, in driving a screw into the conductor, which has been inserted in an opening formed for it in the brush, the threads of the screw working their way into the strands of the conductors and forming` its own screw-threads therein, the size of the opening in the brush being such that when the screw has been driven in, it forces the strands of the conductor against the carbon and the threads of the screw act to hold and bind the conductor so as to prevent its working loose, and in such manner that it practically becomes an integral part of the brush itself.

In the accompanying drawing, Figure l is a view of a brush partly cut away to show the opening for the insertion of the conductor, and the conductor is shown as inserted in said opening; Fig. 2 is a like view, showing the conductor opened out by a sharp pointed tool to receive the screw; Fig. 3 is a like view showing a screw driven into position; Fig. 4 is a perspective view of the carbon-brush with the conductor screwed therein, and Fig. 5 is a section on the line 5 5, Fig. 4. f y

Referring to the drawings, the numeral 2 designates the carbon-brush which may be of any suitable construction, provided with the aperture or passage 3 to receive the con ductor 4, which may be of the ordinary woven typ@ or of the strand type as may be desired. This conductor is inserted in the passage 3 and when inserted-therein a sharp tool or instrument is forced into the inner end ofthe conductor to ope-n it up in the manner indicated in Fig. 2. The screw 5 is inserted in the open end of the conductor 4, inserted within the passage 3 as above set forth, and the screw is screwed into position by a screw-driver, the threads of the screw biting into and forming a corresponding thread in the metal of the conductor, so that when the screw is screwed into place, it has the appearance shown in Fig. 3.

The screw may be of such a length as to extend entirely through the brush, or only partlwa'y through the same, as illustrated, and'when once in place, the end of the screw may be cut ofi to destroy the seat for the screwedriver, so that when once the conductor has been secured in place, it cannot be withdrawn or tampered with. These screws may be formed of a soft metal, such as brass., and the head may be twisted olf, leaving the screw flush with the brush.

As stated above, while I have illustrated my invention in connection with a woven conductor which can be opened up by a sharp tool to receive the screw, I do not wish to limit my invention to such form of conductor, as the ordinary twisted conductor formed of strands may be employed, as the screw will force its way into and form the threads in such a conductor, equally as sol well as in the form of conductor illustrated. l

'ing in the brush, and the screw and conductor become practically an integral part of the brush as indicated in Fig. 5.

By screwing the screw into position, it is gradually worked into place and it does not have a wed '11g action which tends to break the carbon, ut it moves in so gradually and bites its way into the metal of the conductor, which yields and so relieves the strain on the carbon of the brush, while at the same time, when once in place, the withdrawal. of the conductor is practically impossible without destroying the bmah, and it cannot work loose. Where expansion takes place the threads of the screw will oder relief bv bit ing further into the conductor, which will prevent the liability of the crackig or breaking of the carbon brusho i `venteimiqieriezieed 'personsv By this constretion, brash cannot he tempered with nor eanthe conductor be removed to insert` enotherone, which pre- -S old conductors'- in"'other Carbon-brushes,

which ma not beof proper size to carry the' onrrentw ich thebrush may be called upon .t ,".to carry. f y. L x Whatolaim'it .t Y Y10 In .a collectingz brush-for dynitmos,"-nio` 'm1-s. etc.. ther-combination of the carbon# from inserting Witnesses:

brush, havingzfaan opening therein, a. conduetor in said opening, and a screw in said opening engaging said conductor and forming threads in the metal of said conductor.

In testimony whereof, I the said RAY- MDE HAUSEN, have hereunto set my hand.A

' RAYMOND F. HAUSEN.

J. Gmmm HOUSTON', JOHN F. Wm. 

